Abstract

To the best of our knowledge, transient deformations have been
measured in real time with microsecond temporal resolution for the
first time with speckle pattern interferometry. The short exposure
period and high framing rate of a high-speed camera at as many as
40,500 frames per second allow low-power continuous-wave laser
illumination and fiber-optic beam delivery to be used. We have
applied the technique to measure both harmonic vibration and transient
deformation.